Cloth board and similar article



Deco' 7 v H.. B. sMlTH CLOTHA BOARD AND SIMILAR ARTICLE ATI'ORNEYK Patented Dec. 7, 1926.

HARRY BRIDGMAN SMITH, OF BROOKLYN, BOARD CORPORATION, OF BROOKLYN, N

EW YORK, A CORPORATION OF NEW YORK.

CLOTH BOARD AND SIMILAR ARTICLE.

Application filed October 18, 1923. Serial No. 669,388.`

My invention relates to cloth boards and similar articles of a general character similar to those disclosed in a companion applicatilpn (Case A) executed on even date herewit The objects of the present invention are in generalsimilar to those stated in said companion application, but it lis a more particular object of the present invention to still further improve the cloth board structure disclosed in said companion application by so forming the materials and especially the filler materials employed, that, with the same weight of material a board may be produced which has muchgreater thickness, strength and stiffness, or a board of given dimensions and a certainjamount of strength or rigidity may be produced with much less material than has heretofore bee'n possible.

In its physical embodiment, as herein disclosed, the invention comprises a filler consisting of one or more strips or webs of suitv able sheet fibrous material, adhesively secured together, and enclosed in an envelope of suitable sheet fibrous material much wider than the filler sheets or strips, and folded or adhesively secured to completely enclose and cover the broad sides and longitudinal edges and otherwise embodyingv of the filler, characteristics more fully explained in the above mentioned companion application, but with the important addition that the iller strip webs, or certain of them, are embossed or creased in a more or less transverse direction; and preferably these embossings are of a special character, such that the effectivel thickness of the corrugated web is materially increased, and its strength and stiffness' is also very materially increased when properly incorporated in the cloth board structure, with a very small reduction in 'the lengthof filler material provided, and therefore with a given amount of material a very much thicker board, and one which is materially stiffer, stronger and lighter, may be produced, with great economy in the cost of material and also in shipping charges.v

invention are further suiciently explained in connection with the following detail dcscrption of the accompanying drawings,

which show certain exemplifying embodiments of the invention, and also explain s'uiiciently how the articles may be advantageously produced. After considering these embodiments, it will be understood that many variations may be made, and I contemplate the employment loi any structures that are properly within the scope of the ap-- pended claims.

Figure 1 is a perspective view of a cloth board or similar article embodying the invention in one form, with layers of the component materals broken away in progressive fashion for explanatory purposes.'

.Figure 2 is a fragmentary end perspective of the same.

Figure is a perspective view suliciently explaining one suitable method of producing the articles of Figures l and 2.l

Figure 4 is a perspective view of a modified structure.

Figure 5 suilic'iently explains one suitable` method of producing the structure of Figure 4.

As particularly exemplified in Figure 1,

rial such as various grades of cardboard orv 4other lsuitable paper stock, usually of substantial thickness. One important advantage of the invention is that it enables the cheapest available grades of material to be advantageously utilized, and therefore the article may be composed in large part, of material of the kind known as strawboard.

The'complete article comprises a filler F consisting of one or a suitable plurality 'of layers ofsuitable lmaterial such as strawboard` or other suitable paper stock. Speciically, in this particular example, the filler consists of three layers of which two layers consist of embossed or ribbed sheets 1 and 3 and the other is an interposed plain layer consisting of a sheet 2, =which may be of similar material or may be of cardboard of higher grade than strawboard.y The ller layers are adhesively secured together, and the complete filler is enclosed in an envelope consisting of a cover sheet (l` of suitable "fibrous sheet material 'wider than the `filler The characteristics and -advantages of the ,Y

sheets or strips, and usually more than twice as wide, folded and adhesively secured upon the filler as clearly indicated in Figure .1, in which the. longitudinal edges 6 of the envelope are4 brought close together or in abutting re1ation,so vthat thissurface as well as the cloth board is-compos'ed of various layioo the opposite surface of the covered board is entirely lfree and smooth from any projectlons or irregularities. The longitudinal edges 8 are 'also smoothly rounded or conlvexly formed to avoid sharp corners and a great variety of fabrics including very delicate. and expensive fabrics may be wound upon the boardl without possibility of in- ]ury., l

While the embossed layers 1 and 3 may liVvary greatly in character, and in a broader aspect of the invention ordinary corrugated cardboard or strawboard may be used for this purpose, it is preferable to produce the ribs or embossed formationsin a particularl ing cooperating crimping instrumentalities at opposite sides oithe sheets and squeezing .diagonally respective sheets 1 and 3, and preferably also, ribs on' the different sheets are ar-` up a rib or' bead on one side of the sheet and forming an opposite conc'avity or depression in the opposite side, the paper composingl the bead being somewhat broken down in structure and having its component layers somewhat separated and these operations are repeated to form a plurality'of the parallel ribs, which may bein more or less widely spaced relation andl not necessarily very close together. By producin the rib formations in this manner the e fective length of the strip or web of raw material, is very little reduced or? in other words, the effective thickness of the web is matrially increased without very materially shortening -it. Greater structural strength is obtained by arranging-the ribs in respect to the lengt of their ranged in diagonal relation and at a substantial angle to each other.

When a plain sheet 2 is interposed between the embossed sheets adhesive may be l applied all over both faces of the plain sheet,

sheet is alsoadvanced in y 'tinuous web. and. adhesive is suitably applied and the crests of the ribs 5 on sheet 3 will then adhesiv'ely adhere to one face of the plain sheet, and the broader surfaces between the ribs 4 of sheet 1 will adhere to the other surface of the plain sheet. Otherwise adhesive may be applied to the embossed sheets vor to the crests of the ribs thereof.

Figure 3. suiciently explains one suitable method of producing the cloth boards described, this being/what I call a continuous production method in which the filler sheets 1, 2 and 3 are advanced in the form of continuous webs, the creases' or ribs 4 andy 5 are produced on certain of the webs such as '1 'and v3, adhesive is ap lied to certainl web surfaces such as those o web 2 the'envelope the orm of'a con- ,to it or to our surfaces of the core material to which the envelope is applied; the webs are then brought together and secured or folded over and adhesively secured, the longitudinal edges 8 are suitably pressed or 70 otherwise treated to produce the smoothly rounded formation described, Vand the continuous assembly so produced is then severed transversely, vusually at lregular intervals, to produce the completed cloth boards B of suitable length for the purpose in are providedl the ribs 4 or`5, or both which therefore ad- 85 here at every point of intersection.

Figure 5 illustrates a modied reduction method suitable for the articles o Figure 4, which iwill be sulliciently obvious fromthe' preceding explanations, except that, in this '90 instance, one edge margin 10 of the cover web isI overlapped upon the other margin, producing a lapped Joint.

tionable in certain cases, but when desired any irregularity due to the thickness of the overlapped margin 10 may be reducedor eliminated by suitable pressing, producing the formation shown in Figure '4, in which the underlying margin 12 is depressed sufficiently' to eliminate any appreciable rib projection on 'the surface of the completed board. Otherwise the meeting edges ofthe envelope may be skived or beveled to provide a smooth overlapping joint.

While continuous production methods as here briefly explained are preferred in many( cases, Vthe articles may, of course, be produced in other ways. Continuous producltion methods are not a. art of the present invention but aredescrih l a companion application executed on even date herewith. g

lWhatIclaimisz; f e

1. A cloth board or 'similar article, comprising a core sheet of fibrous material having ribs spaced substantially apart, and an envelope sheet of 4paper much wider than the core sheet, folded and adhesively secured to the broad faces of thev core andv ed and claimed in 11 enclosing the longitudinal core edges, and.120

having smooth external surfaces an rounded.- longitudinal ed es.

2. A cloth boar crsimilar article, comy prisin plurality'of filler sheets, at least two o relatively widely spare ribs, the ribs on.

dierent sheets running at an angle 'to each other, and an envelope of fibrous sheet material much wider than the lller structure 'and adhesivelysecured and smooth- 3 which havedia onal embossed and Athe filler sheets being ly covering the broad faces and longitudinal edges of the ller, the longitudinal envelope edges being convexly rounded.

3. A cloth board or the like, comprising a plurality of sheets 'of fibrous ller maf terial adhesively secured together; two of rovided with diavonal widely spaced em ossed ribs, the ribs on the different sheets running at a substantial angle to each other, an intermediate plain filler sheet, and an envelope consisting of a sheet of fibrous material of greater width than the filler sheets, adhesively secured to and smoothly covering the broad prising an envelope consisting of a'single sheet. of substantially smooth paper stock having broad smooth faces and rounded lonl gitudinal edges, and enclosed therein a filler structure `including a sheet of fibrous materia] having thereon a plurality of relative- 1y Widely spaced, parallel crimped creases, which materially increase the thickness and strength of the filler sheetv Without considerable lengthwise contraction thereof.

5. A cloth board or like article comprising at least one filler sheet of fibrous material of substantial thickness, said sheet being formed with ribs projecting at only one side of the sheet and relatively widely spaced apart, the relatively Wide plane sheet areas between the ribs being longitudinally uninterrupted, the filler being enclosed by an envelope of fibrous sheet material adhesively secured to the filler.

Signed at Brooklyn iny the county of Kings and State of New York, this 5th day of Oct., A. D. 1923.

HARRY BRIDGMAN SMITH. 

